Albeit all these MMI codes appear to be comparative, they are basically of many types like Supplementary Service (SS) Code, USSD (Unstructured Supplementary Service Data) Codes, Manufacturer-defined MMI Codes, etc. These MMI codes are relegated to different orders from energizing your telephone parity to checking your IMEI number. And that’s when we call it an invalid MMI Code. And sometimes when we enter the code, we see a message like the code is Invalid. We usually do it in order to check our phone data balance. Whenever you enter a code in your phone that starts with an asterisk (*) and ends with a hash (#), it is called MMI code. MMI Code resembles Man-Machine Interface. Before knowing the invalid MMI code, you must understand what MMI code is.
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